Method, apparatus, and recording medium for encoding/decoding image

Abstract

Disclosed herein are a method, apparatus, and storage medium for image encoding/decoding. In the image decoding method, whether filtering is to be performed across a boundary of a target block is determined, and filtering strength for the boundary of the target block and the number of samples to be used for filtering are determined. Based on this determination, filtering across the boundary of the target block is performed. When the filtering strength and the number of samples are determined, coding parameters related to the target block and a neighbor block, such as a block size and a prediction mode, are used.

1 . A video decoding method, comprising:
 determining whether to perform filtering on a target boundary; and   performing the filtering on the target boundary in a case that it is determined to perform the filtering.   
     
     
         2 . The video decoding method of  claim 1 , wherein:
 the target boundary is a boundary for a specific unit; and   whether to perform filtering on the boundary for the specific unit is determined based on Information for the specific unit.   
     
     
         3 . The video decoding method of  claim 2 , wherein:
 the specific unit is a tile.   
     
     
         4 . The video decoding method of  claim 3 , wherein:
 the Information is signaled in a picture parameter set.   
     
     
         5 . The video decoding method of  claim 1 , wherein:
 the filtering is not performed in a case that the target boundary is not a boundary between units having a size of 4×4 partitioning a picture.   
     
     
         6 . The video decoding method of  claim 1 , wherein:
 the target boundary is a boundary of a target block,   a filtering method of the filtering is determined based on a feature of the target block, and   the feature of the target block comprises a vertical size of the target block.   
     
     
         7 . The video decoding method of  claim 6 , wherein:
 the filtering method comprise a filter length of a filter for the filtering.   
     
     
         8 . The video decoding method of  claim 6 , wherein:
 the filtering method is determined based on whether the vertical size is less than or equal to a specific value.   
     
     
         9 . The video decoding method of  claim 6 , wherein:
 the target boundary is a horizontal boundary.   
     
     
         10 . The video decoding method of  claim 1 , wherein:
 the target boundary is a horizontal boundary between blocks,   the blocks represent chroma components, and   different filtering methods are determined for the blocks.   
     
     
         11 . The video decoding method of  claim 10 , wherein:
 filter lengths of the blocks are different to each other.   
     
     
         12 . The video decoding method of  claim 10 , wherein:
 the target boundary is a vertical boundary of a coding tree unit.   
     
     
         13 . The video decoding method of  claim 1 , wherein:
 Information for determining whether to perform filtering on boundaries of blocks of a specific size is used.   
     
     
         14 . The video decoding method of  claim 13 , wherein:
 the information is applied to boundaries of all blocks in a tile.   
     
     
         15 . The video decoding method of  claim 14 , wherein:
 the information is signaled in a sequence parameter set.   
     
     
         16 . The video decoding method of  claim 13 , wherein:
 the filtering on the boundaries uses a deblocking filter.   
     
     
         17 . The video decoding method of  claim 13 , wherein:
 the filtering on the boundaries uses a sample adaptive offset filter.   
     
     
         18 . The video decoding method of  claim 13 , wherein:
 the filtering on the boundaries uses an adaptive loop filter.   
     
     
         19 . A video encoding method, comprising:
 determining whether to perform filtering on a target boundary; and   performing the filtering on the target boundary in a case that it is determined to perform the filtering.   
     
     
         20 . A non-transitory computer-readable medium storing a bitstream, the bitstream comprising:
 filtering Information, wherein   whether to perform filtering on a target boundary is determined using the filtering Information, and   the filtering on the target boundary is performed in a case that it is determined to perform the filtering.